برآورد مقدار بهینۀ آبدهی ویژه و تخمین تغذیۀ آب زیرزمینی آبخوان آزاد‌دشت گلگیر، استان خوزستان

نوع مقاله : پژوهشی

نویسندگان

1 دانشجوی دکتری آب‌های زیرزمینی، دانشکدۀ علوم زمین، دانشگاه شهید چمران اهواز

2 استاد، دانشکدۀ علوم زمین، دانشگاه شهید چمران اهواز

چکیده

روش نوسانات سطح آب (WTF) بر پایۀ صعود سطح آب بر اثر تغذیۀ آب زیرزمینی استوار است. به‌کارگیری این روش، مستلزم تخمین مناسب مقدار آبدهی ویژه در محدودۀ نوسانات سطح آب زیرزمینی است. در این مقاله، مقدار آبدهی ویژه از روش لاگ چاه‏های حفاری (DWL)، روش پوشش خط مستقیم (ESL) و روش سونداژ الکتریکی قائم (VES) تخمین زده شد. به‌منظور ارزیابی و انتخاب روش مناسب‏، مقدار آبدهی ویژه از داده‏های هیدرولوژیکی و هیدروژئولوژیکی هشت‌ساله (1385 تا 1392) دشت گلگیر با ضریب همبستگی برای رابطۀ بین تغذیه‌ـ بارندگی و تغذیه‌ـ جریان پایه در روش پوشش خط مستقیم (ESL) به‌ترتیب با 79/0 r2= و 90/0 r2= به‌دست آمد. همچنین، با توجه به ضریب همبستگی مناسب روش ESL، مقدار بهینۀ آبدهی ویژه برای دشت گلگیر برابر 12/0 تخمین زده شد. ضریب همبستگی به‌دست‌آمده از رابطۀ بین میزان تغذیۀ آب‏ زیرزمینی، جریان پایه و بارندگی در روش‏های DWL، ESL و VES نیز دقت زیاد روش ESL را نشان داد که روش ESL با 90/0=r2 بهترین تخمین مقدار آبدهی ویژه را دارد. بنابراین، با توجه به اهمیت مقدار تغذیه در مدیریت و برنامه‏ریزی منابع آب ‏زیرزمینی و تأثیر زیاد مقدار آبدهی ویژه در روش WTF، تخمین تغذیۀ آب‏ زیرزمینی با استفاده از مقدار بهینۀ آبدهی ویژه کمک شایانی به محققان علوم آب می‏کند.

کلیدواژه‌ها


عنوان مقاله [English]

Assessment the Specific Yield Optimal Value and Groundwater Recharge Estimate of Unconfined Aquifer on Golgir plain, Khuzestan Province

نویسندگان [English]

  • Saeed Tourk Qashqai Nejad 1
  • Manouchehr Chitsazan 2
1 Ph.D. Student, Earth Sciences Faculty, Shahid Chamran University, Ahvaz, Iran
2 Professor, Earth Sciences Faculty, Shahid Chamran University, Ahvaz, Iran
چکیده [English]

The water table fluctuation (WTF) method is based on rises of a water table are caused by recharging groundwater. To apply this method, an appropriate estimate of the specific yield in the zone of the groundwater level fluctuation is required. In this paper, the specific yield are estimated these methods include Drilling Well Logs (DWL), Envelope Straight Line (ESL) and Vertical Electrical Sounding (VES) method. To evaluate and choosing the best method, specific yields value by hydrologic and hydrogeological data during eight years (2006 to 2013) of Golgir plain with correlation coefficient between recharge-rainfall and recharge-baseflow in ESL method respectively was obtained r2=0.79 and r2=0.90. Also, attention to appropriate correlation coefficient in ESL method the specific yield optimized amount equal 0.12 for Golgir plain estimated. The coefficient correlation obtained from the relation between recharge groundwater value, base flow, and rainfall by using DWL, ESL and VES methods indicated that ESL method with r2=90 is the best method to estimate the specific yield. Hence, attention to importance of recharge value in planning and management of groundwater and high affection of specific yield value in WTF method, groundwater recharge estimation by using specific yield optimal value help to the water science researchers.

کلیدواژه‌ها [English]

  • Golgir plain
  • Groundwater recharge
  • Specific Yield
  • WTF method
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